Ah - I'm running ES 2.0 beta 1 (just released yesterday) and a snapshot build of Kibana 4.2 (which you can get at the bottom of the page here, and should be released as 4.2 beta soon).
When I run this on ES 1.6 and Kibana 4.1.1 I get the same error as you. Let me see if I can get some clarification on that.
